mysql-排序、分組

• 排序 

# 以Gid字段爲基礎進行降序排序
select * from student order by Gid desc

# 以Gid字段爲基礎進行升序排序
select * from student order by Gid asc

• 分組

# where Sid!=2：找出Sid不等於2的數據，
# group by Gid：然後以Gid字段爲基礎進行分組，每組只顯示第一行數據
# having Sid > 10：如果某個組中的有Sid大於10，則把該組剔除
select * from student where Sid!=2 group by Gid having Sid > 10